** Shares of oil and gas explorer Vintage Energy VEN.AX rise 25% to A$0.005, their highest level since Feb 9
** Set for best day since Jan 26
** Co's 50%-owned Southern Flank gas projects get A$5 million ($3.52 million) in grants from South Australian government
** Stock flat YTD, including current moves
($1 = 1.4215 Australian dollars)
(Reporting by Jasmeen Ara Shaikh in Bengaluru)
((Jasmeenaraislam.Shaikh@thomsonreuters.com;))